Muck boots woody max cold conditions this warm boot has kept hunters toasty for nearly a decade with a 5mm cr flex foam fleece liner with the added 2mm thermal foam under foot its a proven combination at frigid temperatures embraced by hunters on the stand and in the blind fasteningslip on material compositionother materialsother materialsother materialsother materialscare instructionspolishing will help prolong life and will assist removing unwanted marks scuffs and scrapes warm fle